Just a curious question because the H2D makes such a big startup production. Does the nozzle specifically test to find out how far each nozzle is by pressing down at the specific area at the back of the bed? Or does it just have a default amount of millimeters from the left nozzle to the right? I can’t help but think changing nozzles would mess with that alignment and I’ve not yet swapped out nozzles. Therefore I am assuming since it has a nozzle calibration that it tests the locations every test.
I think it is just checking nozzle offset the next time you use it, so that’s take care of X and Y and check Z when it does homing/bed levelling again the next time you use it. All of this should be OK if you set it to On or Auto and of course not so much if you disable both nozzle offset and levelling…
If you use only one nozzle even if it’s the one you replaced, the absolute location of the tip might be slightly off on the plate by some of hundreds of mm in X and Y depending on the manufacturing tolerance but the relative location of any points of your model will still be exactly right. Z will still be checked during homing.
There is a sensor that is in the center of the back of the build plate right in front of the center lead screw. Anytime you do a multi nozzle print it will do a quick nozzle offset calibration. And then when you do bed leveling you will notice it uses two passes, one with each nozzle. I swap nozzles like crazy because I swap nozzles anytime I go from a low temp filament to a high temp filament or TPU. I haven’t had any issues relating to nozzle changes
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That’s good to know. That’s what I suspected that the point at the back behind the plate had something to do with it. Interesting stuff. Good to know you are able to change nozzles w/o issue I was a little nervous about it.